linux-kernel - Regression: turbostat stops working after suspend/resume cycle

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Message-ID: <3301457.KOfdo1KMTP@xps13>
Date:	Sun, 17 May 2015 17:48:44 +0200
From:	Gabriele Mazzotta <gabriele.mzt@...il.com>
To:	juri.lelli@....com, mingo@...hat.com, peterz@...radead.org
Cc:	linux-kernel@...r.kernel.org, len.brown@...el.com,
	andrey.semin@...el.com
Subject: Regression: turbostat stops working after suspend/resume cycle

Hi,

I've recently noticed that if I suspend and resume my laptop, I can no
longer execute turbostat. This is what I get when I try to start it:
# turbostat
Could not migrate to CPU 1
turbostat: re-initialized with num_cpus 4
Could not migrate to CPU 1

Since everything works as expected with v4.0, I ran a bisection and
found that commit 3c18d447b3b36a8d ("sched/core: Check for available
DL bandwidth in cpuset_cpu_inactive()") is the cause of the regression.

I don't know if there's something else affected by that change, but
I can consistently reproduce the bug with turbostat.

I can provide more info if needed.

Regards,
Gabriele
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